John,
I use a version of an OAG (reflective slit guiding) on my C11 at f10 with a Lodestar guide camera...
I'll double check the settings I use on PHD 1.13, but I'm almost sure I just use the defaults....
Good adaptor connections (Threaded parts given a smear of boot polish!) and good balance I think are the key....
If I find the settings are different, I'll edit this post.
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